Hi Krishna,
I assume you are talking about a PER encoding when you speak of bits.
A single bit is sufficient because you can not have both in combination.
The meanings of the two keywords are really quite similar. In PER,
no value is transmitted if either an OPTIONAL is omitted or a
DEFAULT value is used. On the receiving end, if you don't receive an
OPTIONAL, a value does not exist. If you don't receive a DEFAULT, the
value from the specification should be used.
Regards,
Ed Day
Principal Engineer
Objective Systems, Inc.
[EMAIL PROTECTED]
(610) 608-4930 (voice)
(610) 321-0361 (fax)
(877) 820-4164 (toll-free voicemail & fax)
Bujji krishna R B wrote:
>
> Hi,
> I would like to know the significance of the key word DEFAULT in ASN.1.
> Is this different from OPTIONAL keyword.
> If I have understood correctly , the keyword DEFAULT indicates that if a
> particular Identifier's (declared as DEFAULT)
> value is not specified during transmission then the receiver has to assign
> his own value.
>
> If this is the case , then one should have two different flags(or Bits) to
> indicate DEFAULT and OPTIONAL status and not
> a single flag while transmitting the bits.
>
> Thanks
> krishna
